Geo Adventure: The Complete Series is a compilation of platform games. It was released in 2013. It has an "unlocking" system to unlock games past the first Geo Adventure. The other games can be unlocked by completing certain objectives (10 in total) for each previous game. For example, to unlock Geo Adventure Advance, you have to beat a boss in under a minute in Geo Adventure 3, among other things. Other Geo's World games are easter eggs which be unlocked by collecting the letters that spell out "GEOGUY" throughout all of the main games, as well as several other methods.